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Title: feat: Add Vector Search support to MongoDBOnlineStore by caseyclements · Pull Request #6344 · feast-dev/feast · GitHub

Open Graph Title: feat: Add Vector Search support to MongoDBOnlineStore by caseyclements · Pull Request #6344 · feast-dev/feast

X Title: feat: Add Vector Search support to MongoDBOnlineStore by caseyclements · Pull Request #6344 · feast-dev/feast

Description: What this PR does / why we need it: Adds MongoDB Atlas Vector Search support to MongoDBOnlineStore, enabling similarity search over feature embeddings stored in MongoDB Atlas. Changes: MongoDBOnlineStoreConfig: Extends VectorStoreConfig to inherit vector_enabled and similarity fields. Adds vector_index_wait_timeout for controlling how long to wait for newly created Atlas Search indexes to become queryable. MongoDBOnlineStore.update(): When vector_enabled=True, automatically creates Atlas vector search indexes for any FeatureView fields that have vector_index=True. Ensures the underlying collection exists before index creation (required by Atlas). Drops vector indexes for removed feature views. MongoDBOnlineStore.retrieve_online_documents_v2(): Implements similarity search using the $vectorSearch aggregation stage. Returns results as (event_ts, entity_key_proto, feature_dict) tuples with a synthetic distance field containing the vector search score. Coerces query vectors to native Python floats for BSON compatibility. MongoDBAtlasOnlineStoreCreator: Test infrastructure using MongoDBAtlasLocalContainer from testcontainers-python to spin up mongodb/mongodb-atlas-local:8.0.4 for integration testing. Integration tests (test_mongodb_vector_search.py): Covers index lifecycle (create on update(), drop on teardown()), write + retrieve round-trip with known embeddings, and top_k limiting. Dependencies: Uses existing pymongo >= 4.13.0 Atlas Search index APIs (SearchIndexModel, create_search_index, list_search_indexes, drop_search_index). No change here. The integration tests require testcontainers.mongodb.MongoDBAtlasLocalContainer, which is, as of April 30th, available in testcontainers=4.15.0rc2. See testcontainers pull/873 Which issue(s) this PR fixes: Closes MongoDB ticket INTPYTHON-921 Checks I've made sure the tests are passing. My commits are signed off (git commit -s) My PR title follows conventional commits format Testing Strategy Unit tests Integration tests Manual tests Testing is not required for this change Misc The integration tests use the mongodb/mongodb-atlas-local:8.0.4 Docker image via testcontainers. A configurable INDEX_WAIT (default 5s) accounts for Atlas Search index eventual consistency after writes. Verified that existing unit tests (676 passed) and MongoDB universal integration tests (75 passed) are unaffected by these changes.

Open Graph Description: What this PR does / why we need it: Adds MongoDB Atlas Vector Search support to MongoDBOnlineStore, enabling similarity search over feature embeddings stored in MongoDB Atlas. Changes: MongoDBOnl...

X Description: What this PR does / why we need it: Adds MongoDB Atlas Vector Search support to MongoDBOnlineStore, enabling similarity search over feature embeddings stored in MongoDB Atlas. Changes: MongoDBOnl...

Opengraph URL: https://github.com/feast-dev/feast/pull/6344

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8c3fdf0 feat: add MongoDB Atlas Vector Search support to MongoDBOnlineStore caseyclements Apr 27, 2026 https://github.com/feast-dev/feast/pull/6344/commits/8c3fdf0a45581669971f7240c965cd59408c2b6b
8482920 fix: ensure collection exists before vector index creation, add INDEX… caseyclements Apr 27, 2026 https://github.com/feast-dev/feast/pull/6344/commits/8482920287d6728d4e1b6ef46c3e6922f68e2ef1
e69cdb4 fix: use float32 in test data and coerce query vector to native floats caseyclements Apr 28, 2026 https://github.com/feast-dev/feast/pull/6344/commits/e69cdb41b48b887a8ddca15266a3b40ee895814b
88f6827 test: add vector search validation unit tests and idempotency integra… caseyclements Apr 28, 2026 https://github.com/feast-dev/feast/pull/6344/commits/88f682745a68fe013a3eb7e467ab5e9392d05f55
5ddb3e2 feat: upgrade testcontainers to 4.15.0rc2 and use MongoDBAtlasLocalCo… caseyclements Apr 30, 2026 https://github.com/feast-dev/feast/pull/6344/commits/5ddb3e2857783228da56fb2b08db2d51be90d189
c0ab443 fix: check bool before int in _python_value_to_proto caseyclements Apr 30, 2026 https://github.com/feast-dev/feast/pull/6344/commits/c0ab443272f7f40b9fa9f9a5ef4092366f7f3278
4becf7e docs: note composite vector index as future optimization caseyclements Apr 30, 2026 https://github.com/feast-dev/feast/pull/6344/commits/4becf7e6c2918c2e253826e030e565a5f451ff0e
81aea6e chore: regenerate requirement lockfiles caseyclements Apr 30, 2026 https://github.com/feast-dev/feast/pull/6344/commits/81aea6e3779de13e47ee6e47cb777f7f096db8ed
4f142a3 -s caseyclements May 1, 2026 https://github.com/feast-dev/feast/pull/6344/commits/4f142a3c12212deaf843622230844e1f46b73632
22cc690 chore: merge upstream/master and regenerate lockfiles caseyclements May 1, 2026 https://github.com/feast-dev/feast/pull/6344/commits/22cc69041d00b88afef05905d5c7a20247f63524
d4cc897 fix: add dialect=pymysql to MySqlContainer after testcontainers upgrade caseyclements May 1, 2026 https://github.com/feast-dev/feast/pull/6344/commits/d4cc897d606900ceae953d1b237744c8f40e9889
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